Metro apps are now officially called...
...Windows 8 apps. :)
Microsoft: Don't call it Metro. Call it 'Windows 8' « ZDNet
An obvious choice that will cause no confusion whatsoever. :D
The new substitute terminology upon which the Softies have decided is -- drum roll -- "Windows 8," according to my sources.
Here's the official guidance, my sources say: Anything currently/formerly known as a "Metro-Style application" (with or without a hyphen) will now be known officially as a "Windows 8 application." References to the "Metro user interface" will now be replaced by "Windows 8 user interface." And instead of saying "Metro design," the Softies and those adhering to their official guidelines will be using the words "Windows 8 design."